Other

United States Borax Chemical Corporation

Mineral Process Licensing Corp. B.v.

Anthony J Wickens

John H Turner

Geoffrey K Creffield

Anthony C Dowd

Vernon F Henley

Charles E Shackleton, Deceased

By Edward Shackleton, Executor

A process is disclosed for the production of micaceous iron oxide using metallic iron, for example scrap iron, as a feed stock for the preparation of an iron chloride and the resulting iron chloride is oxidized at an elevated temperature in the presence of a salt of an alkali metal or alkaline earth metal, preferably sodium chloride. A reaction may be effected in a packed tower reactor comprising a refractory tube 7 containing an inert packing material e.g. aluminosilicate ceramic balls. The reaction charge including packing material, metallic iron and the salt is introduced via hopper 13. A tube 7 is externally heated by electrical resistance elements 10 and chlorine and an oxidizing gas are introduced at inlet 8 and the off-gas removed at outlet 9. The micaceous iron reaction product is obtained as a coating on the inert packing material. Micaceous iron oxide is used as a pigment for the formulation of metal protective paints.

Process for preparing an iron oxide

Method of anodizing aluminum by subjecting it to electrolysis, first in a bath of electrolyte containing a borate and then in a bath of electrolyte containing an acid. Preferably, the electrolyte in the first bath is about 3-5% borax with the pH adjusted to about 9 to 11 by addition of sodium hydroxide. The method forms an oxide coating which is of sufficient depth to comply with normal specifications and which also does not suffer from alkaline staining.

Anodizing aluminum

The invention relates to a process for the preparation of anhydrous magnesium chloride from magnesium carbonate preferably magnesium carbonate ores such as magnesite. The process comprises reacting solid magnesium carbonate pieces preferably screened ore in a packed bed reactor comprising the magnesium carbonate pieces with gaseous chlorine in the presence of carbon monoxide at a temperature above the melting point of magnesium chloride and below 1200.degree. C. The off-gas predominantly carbon dioxide is withdrawn from above the packed bed and molten anhydrous magnesium chloride is withdrawn from below the packed bed. The invention provides a process having low energy requirements which can be applied industrially on a continuous basis using simple apparatus.

Preparation of anhydrous magnesium chloride

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Rudgwick, United Kingdom

Anthony J Wickens